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Rain water harvesting is the process of collecting water.  The rainwater collected can be stored for direct use or can be recharged into the groundwater. Rain is the first form of water that we know in the hydrological cycle, hence is a primary source of water for us. Rivers, lakes and groundwater are all secondary sources of water.
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The process of collecting and storing rainwater on a roof or a surface catchment is called rainwater harvesting.
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